River Taff

River Taff
The Taff flowing through Llandaff
Native nameAfon Taf (Welsh)
Location
CountryWales
Historic countyGlamorgan
Unitary AuthorityMerthyr Tydfil, Rhondda Cynon Taf, Cardiff
SettlementsMerthyr Tydfil, Treharris, Pontypridd, Cardiff
Physical characteristics
SourceTaf Fawr
 • locationCorn Du, Brecon Beacons, Powys, Wales
2nd sourceTaf Fechan
 • locationPen y Fan, Brecon Beacons, Powys, Wales
MouthCardiff Bay
 • location
Cardiff, Wales
Length67 km (42 mi)
Discharge 
 • locationCardiff Bay
Basin features
Tributaries 
 • leftBargoed Taf
 • rightCynon, Rhondda

The River Taff (Welsh: Afon Taf) is a river in Wales. It rises in the Brecon Beacons as two rivers, the Taf Fechan ("little Taff") and the Taf Fawr ("great Taff") before becoming one just north of Merthyr Tydfil. At Cardiff, it empties into the Bristol Channel.

The river supports several species of migratory fish, including salmon, sewins (sea trout), and eels.